Firewall
A firewall is a network security tool that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It acts as a barrier between a trusted internal network and untrusted external networks, such as the internet, to prevent unauthorized access and cyber threats. Firewalls can be implemented as hardware devices, software applications, or cloud-based services, and they are essential for protecting systems and data in modern computing environments.
Developers should learn firewall setup to secure applications and infrastructure, especially when deploying web services, APIs, or cloud-based systems that are exposed to the internet. It is crucial for compliance with security standards (e.g., GDPR, HIPAA) and for preventing attacks like DDoS, malware, and data breaches. Knowledge of firewalls is also valuable in DevOps and system administration roles to configure network policies and ensure safe communication between services.